I have a hole in my Acerbis tank. I did the dual sport ride at the Desert 100 in Odessa, WA last weekend and near the end of the ride I noticed a smell of gas. After looking around a bit, I found there is a tiny tear in the tank where the left side wing meets up with the larger main part of the tank. Bummer!
It looks like it was caused by the tank flexing over time.
Here are some pictures.